1. CHEM 433 – 9/20/11 II. Gases B. “Real” Gases (1.3)
- “Ideal” vs. “Real”: Macro & Micro
- The compression factor
- The virial equation —>
—> Real Gas Isotherms
READ: Chapter #1 –we finish it tomorrow … !!!
HW: Due Th at 4 – or F ?
Exam #1 coming next week (W?)

2. Ideal Gas Law:
PV=nRT
An “Equation of State”…
Relates 4 variables that describe the state of a gas - only 3 of which are truly independent.
Or: PVm=RT
Where Vm= V/n (molar V), 3 variables - only 2 independent…

4. Talk about these two things:
1) What is the microscopic implication of the points on the curves (aside from (0,1)) where Z=1?
• Sketch in a guess of the curve for C2H3F. (how do its forces differ?)

5. Real gas “isotherms”
~Like ideal at high T -
then “not so much …”
P(V) = ??? T constant

6. Isotherms:
IDEAL (P~1/V) REAL (P~1/V+1/V2+1/V3…)